sign manual(n = noun.communication) - the signature of a sovereign on an official document;
is a kind of signature

N  writing, chirography, stelography, cerography, penmanship, craftmanship, quill driving, typewriting, writing, manuscript, MS, literae scriptae, these presents, stroke of the pen, dash of the pen, coupe de plume, line, headline, pen and ink, letter, uncial writing, cuneiform character, arrowhead, Ogham, Runes, hieroglyphic, contraction, Brahmi, Devanagari, Nagari, script, shorthand, stenography, brachygraphy, tachygraphy, secret writing, writing in cipher, cryptography, stenography, phonography, pasigraphy, Polygraphy, logography, copy, transcript, rescript, rough copy, fair copy, handwriting, signature, sign manual, autograph, monograph, holograph, hand, fist, calligraphy, good hand, running hand, flowing hand, cursive hand, legible hand, bold hand, cacography, griffonage, barbouillage, bad hand, cramped hand, crabbed hand, illegible hand, scribble, pattes de mouche, ill-formed letters, pothooks and hangers, stationery, pen, quill, goose quill, pencil, style, paper, foolscap, parchment, vellum, papyrus, tablet, slate, marble, pillar, table, blackboard, ink bottle, ink horn, ink pot, ink stand, ink well, typewriter, transcription, inscription, superscription, graphology, composition, authorship, cacoethes scribendi, graphoidea, graphomania, phrenoia, writer, scribe, amanuensis, scrivener, secretary, clerk, penman, copyist, transcriber, quill driver, stenographer, typewriter, typist, writer for the press, writing, written, in writing, in black and white, under one's hand, uncial, Runic, cuneiform, hieroglyphical, currente calamo, pen in hand, audacter et sincere, le style est l'homme meme, nature's noblest gift - my gray goose quill, scribendi recte sapere et principium et fons, that mighty instrument of little men, the pen became a clarion.

N  indication, symbolism, symbolization, semiology, semiotics, semeiology, semeiotics, Zeitgeist, characteristic, diagnostic, lineament, feature, trait, fingerprint, voiceprint, footprint, noseprint, cloven hoof, footfall, recognition (memory), diagnostic, divining rod, detector, sign, symbol, index, indice, indicator, point, pointer, exponent, note, token, symptom, dollar sign, dollar mark, type, figure, emblem, cipher, device, representation, epigraph, motto, posy, gesture, gesticulation, pantomime, wink, glance, leer, nod, shrug, beck, touch, nudge, dactylology, dactylonomy, freemasonry, telegraphy, chirology, byplay, dumb show, cue, hint, clue, clew, key, scent, signal, signal post, rocket, blue light, watch fire, watch tower, telegraph, semaphore, flagstaff, cresset, fiery cross, calumet, heliograph, guidon, headlight, mark, scratch, line, stroke, dash, score, stripe, streak, tick, dot, point, notch, nick, print, imprint, impress, impression, keyboard symbols, printing symbols, red letter, italics, sublineation, underlining, bold font, jotting, note, annotation, reference, blaze, cedilla, guillemets, hachure, quotation marks, ", double quotes, " ", parentheses, "( )", brackets, "", braces, "", left arrow, "<", right arrow, ">", forward slash, "/", backward slash, "\", exclamation point, "!", commercial at, "@", pound sign, "#", percent sign, "%", carat, "", ampersand, "&", asterisk, "*", hyphen, "-", dash, "-", "_", em dash, "--", plus sign, "+", equals sign, "=", question mark, "?", period, ", ", semicolon, ", ", colon, ":", comma, ", ", apostrophe, "'", single quote, "'", tilde, "~", badge, criterion, countercheck, countermark, countersign, counterfoil, duplicate, tally, label, ticket, billet, letter, counter, check, chip, chop, dib, totem, tessera, card, bill, witness, voucher, stamp, cacher, trade mark, Hall mark, signature, mark, autograph, autography, attestation, hand, hand writing, sign manual, cipher, seal, sigil, signet, hand and seal, paraph, brand, superscription, indorsement, endorsement, password, watchword, catchword, security card, pass, passkey, credentials, open sesame, timbrology, mot de passe, mot du guet, pass-parole, shibboleth, title, heading, docket, address card, visiting card, carte de visite, insignia, banner, banneret, bannerol, bandrol, flag, colors, streamer, standard, eagle, labarum, oriflamb, oriflamme, figurehead, ensign, pennon, pennant, pendant, burgee, blue Peter, jack, ancient, gonfalon, union jack, banderole, old glory, quarantine flag, vexillum, yellow-flag, yellow jack, tricolor, stars and stripes, bunting, heraldry, crest, coat of arms, arms, armorial bearings, hatchment, escutcheon, scutcheon, shield, supporters, livery, uniform, cockade, epaulet, chevron, garland, love knot, favor, beacon, cairn, post, staff, flagstaff, hand, pointer, vane, cock, weathercock, guidepost, handpost, fingerpost, directing post, signpost, pillars of Hercules, pharos, bale-fire, beacon-fire, l'etoile du Nord, landmark, seamark, lighthouse, balize, polestar, loadstar, lodestar, cynosure, guide, address, direction, name, sign, signboard, warning, omen, prefigurement, trace, record, warning &c, alarm, scepter, trophy, gauge, milestone, milepost, brand, fool's cap, check, telltale, test, mileage ticket, milliary, notification, advertisement, word of command, call, bugle call, trumpet call, bell, alarum, cry, battle cry, rallying cry, angelus, reveille, sacring bell, sanctus bell, exposition &c (explanation), proof, pattern, indicating, indicative, indicatory, denotative, connotative, diacritical, representative, typical, symbolic, pantomimic, pathognomonic, symptomatic, characteristic, demonstrative, diagnostic, exponential, emblematic, armorial, individual, known by, recognizable by, indicated, pointed, marked, denotable, indelible, in token of, symbolically, in dumb show, ecce signum, ex ungue leonem, ex pede Herculem, vide ut supra, vultus ariete fortior.

american sign language, babinski sign, danger sign, dollar sign, equal sign, high sign, instruction manual, jacquemier's sign, kernig's sign, manual, manual alphabet, manual dexterity, manual labor, manual laborer, manual labour, manual of arms, minus sign, percent sign, percentage sign, plus sign, radical sign, raynaud's sign, re sign, reference manual, sex manual, sign, sign away, sign in, sign industry, sign language, sign of the cross, sign of the zodiac, sign off, sign on, sign over, sign painter, sign up, star sign, street sign, sure sign, telltale sign, v sign, vital sign