An arrow:
Arrow:

A "T":

An "F":

A "GF"?:

Another T:

An "E":

A triangle, this one in concrete:

An "A":

Blobs or squares:
A 'D"?:
An E:

box with lines down:

Box with a dash:

Dash in a box:

A summary of the above shapes:
I think the left half are all water valve symbols. I would guess the E is electric and T for telephone?
5 comments:
Cool!
Good eyes! I've never noticed any such marks/symbols.
Reminds me of hobo markings, a coded language to identify locations and situations for those riding the rails.
Last night I noticed a couple dozen of these clustered around Elm and 9th.
Is this where you took the pictures.
^they are all over the city on old curbs.
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