Written Sound
Onomatopoeia Dictionary
Words that sound like the thing they mean: Imitative words. From the Greek "onoma" (name) and "poiein" (to make)

chumma chumma chumma, hufft hufft, falump

Sounds made by an excavator (From Diggers go by Steve Light). In the book all caps CHUMMA CHUMMA CHUMMA, HUFFT HUFFT FALUMP

engine metal digging

gr gr k k grk

Sound of scraping and hammering in rocky material at an archeological / paleontological excavation. from:
Dinosaur King Vol 1, by Yohei Sakai. All caps in the book: GR GR K K GRK

stone carving metal digging

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