human lettering; forming characters with people
Refers to the act of many people positioning themselves to create a giant character or message, often seen at school sports days or mass performances.
The students formed human letters at the sports day.
The spectators created a human message in the stadium.
Compound of 人 (ひと, person) and 文字 (もじ, character). The reading ひともじ is a straightforward combination of the two elements.