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https://duckduckgo.com/?q=why+symbols+covering+mouth+context&t=h_&ia=web

DuckDuckGo で「why symbols covering mouth context」で調べる。
以下のページがヒット。

Serious Face With Symbols Covering Mouth (aka Swearing) Emoji
https://emojipedia.org/face-with-symbols-on-mouth/

> An angry-red face with a black bar and white grawlixes covering its mouth, indicating it's swearing or being vulgar. Grawlixes are typographical symbols (e.g., @#$%&!) representing swear words or obscenities.

grawlix - Wiktionary
https://en.wiktionary.org/wiki/grawlix

> A meaningless word[1] coined by the American comic strip writer Mort Walker (1923–2018) in a humorous article entitled “Let’s Get Down to Grawlixes” published in The Cartoonist (1964),[2][3] possibly influenced by growl.[4]

というわけで合ってそうなので、これで答えです

そういえばごく自然に英語での名前探してたわ、日本語だと何と言うのだろうか……

https://trapezial.com/objects/fb34d23a-81b7-4d9b-a6b0-ca271e98d4fa

「ふじこ」かもしれんw