What do you call an object 1) the size of a PC keyboard or smaller; 2) a company carries to a trade show and puts on their table 3) so that potential customers know the name of that company. 4) I call it a brand/logo panel
Although these objects are commercially marketed nowadays as “table-top display signs,” as documented by Spehro Pefhany, they are also referred to as placards and posters.
placard noun: 1. A sign or notice for display in a public place. 2. A small card or plaque, such as a nameplate on a door. synonyms: notice, poster, sign, bill, advertisement; see, the Free Dictionary
placard (n.) late 15c., "formal document authenticated by an affixed seal," from Middle French placquard "official document with a large, flat seal," also "plate of armor," from Old French plaquier "to lay on, cover up, plaster over," from Middle Dutch placken "to patch (a garment), to plaster," related to Middle High German placke "patch, stain," German Placken "spot, patch." Meaning "poster" first recorded 1550s in English; this sense is in Middle French from 15c.; see, etymonline
poster noun: 1. a placard or bill posted or intended for posting in a public place, as for advertising. see, Dictionary.com
(n.) "bill, placard, thing posted," 1838, from post (v.1). Poster
boy/girl/child "someone given prominence in certain causes" is
attested by 1990, in reference to fund-raising drives for charities
associated with disability, featuring child sufferers, a feature since
1930s. see, etymonline
(n.) 1848, "ornamental plate or tablet," from French plaque "metal
plate, coin" (15c.), perhaps through Flemish placke "small coin," from
Middle Dutch placke "disk, patch, stain," related to German Placken
"spot, patch" (compare placard). Meaning "deposit on walls of
arteries" is first attested 1891; that of "bacteria deposits on teeth"
is 1898. see, etymonline