What is that 293 represents/indicates in HEK 293?

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Matthew James Conroy

https://en.wikipedia.org/wiki/HEK_293_cells#History

Kousalya Lavudi

During the experiments performed by Frank Graham, in his 293rd experiment, one clone was survived. Hence named HEK293.

Jitender Nandal

https://en.wikipedia.org/wiki/HEK_293_cells#:~:text=They%20were%20published%20in%201977,was%20from%20his%20293rd%20experiment

Maybe the link can help.

This is experiment no or the clone no.