We need to get Lindybeige in here

Growing up I always learned (I think) the “insert missing text” symbol was shaped like the one in the pic, like a caret symbol.

The odd thing is I also remember the caret and inserted word being at the top like in OP’s image, but style guides I can find now show the caret at the bottom and the inserted text at the top.

https://www.csuchico.edu/style-guide/guidelines/copy-editing-marks.shtml#%3A~%3Atext=A+caret+shows+where+an%2Coften+written+in+the+margin.

https://books.byui.edu/fhgen_110_textbook_/chapter_16_deciphering_elements_of_handwritten_records#%3A~%3Atext=are+shown+here%3A-%2CInserted+Words%2Cadded+on+the+line+ above (search for caret)

https://grammarist.com/editing/proofreading-editing-marks-symbols/

Wikipedia seems to indicate using a downward facing caret, or a caret with an extra upward arm https://en.m.wikipedia.org/wiki/Caret_(proofreading)

TIL!

All that to say the formatting of OP’s pic, no matter the direction of the arrow/caret, makes it hard to read. A little “don’t dead open inside” or something.

Edit to add: This one shows it the way I remember it https://dmlfnsgrade9isawesome.weebly.com/editing1.html

The USA can join the Commonwealth by becoming a Territory of Canada. Just give us a sec while we change the rules on representation in the house of Commons.

The Kite Runner is a great book that describes this but in Afghanistan.

For the kids: https://en.m.wikipedia.org/wiki/Rescue_of_Jessica_McClure