luettelette
Luettelette is a rarely used term that appears in obscure or speculative discussions of typography and linguistics. It does not have a standard definition in major dictionaries and is not part of established technical vocabulary. The word seems to be a French neologism formed from luette, a nonstandard or informal word for “letter,” plus the diminutive suffix -ette, yielding a sense of “little letter.” Because luette is not widely used in formal contexts, the precise meaning of luettelette remains unsettled and varies by author.
In some informal or experimental writings, luettelette may be invoked to denote a hypothetical tiny letter
Due to its lack of widespread adoption, luettelette should be understood as a provisional or contextual label