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You mean an onomatope (to be pendantic)? In any case, it's not clear to me exactly what you mean.

Apparently "onomatope" is a much less popular name for the same thing (e.g. Wikipedia uses my version).

I mean that the "remove a word" 'symbol' is a 'word' that represents the verb he was trying to invoke, by sounding like it.

Birds chirp, bees buzz, moderators, toilets flush.

Apologies if I'm being totally thick, but you're saying the lack of a word is acting as an onomatope (or an onomatopoeia if you prefer)?

Yes. You could say this is the sound of silence.

Someone accidentally the whole thing.