Your own link states that this is primarily a division symbol, hard to take this seriously...

"It also has other uses in a variety of specialist contexts." [1] Language is complex and signs often have more than one signification, but one must have curiosity and endeavour beyond what stands prima facie.

[1] https://en.wikipedia.org/wiki/Obelus#:~:text=It%20also%20has....

I see, this is a novel use you have settled on. Thanks for naming the symbol for me.

With this specific meaning of "range between"/"closed interval" it is often used in Eastern European italo-/franco-phone languages/texts. A short history of obelus on StackExchange [1].

[1] https://hsm.stackexchange.com/a/9530

Ah ha I see. Thank you.