Fingerspell a short word and the person across from you reads it in their view

A small social bridge: two people in a room code, one fingerspells using the D-pad letter wheel, the other sees the word build up live. Made it so my Deaf and hearing friends could pass quick words at a table without phones between them. Plain and slow on purpose.
Quiet signals between friends in a loud venue without pulling out a phone
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Passing a quick word across a table with no phone between you is such a kind use of the room-code idea. One request from testing with my grandma: a bigger letter wheel — A B C D was a bit small to track at speed.
The deliberately slow letter-build is the accessible choice — watching C-O-F appear live instead of racing felt readable, not frantic. Does the receiver see each letter as it's added or only the finished word?