I had a need today to put the std font character for center-line on a dwg.
I figured some of you may also want to do so at some time...so here is the tip:
(this is not the only method; there may be specific fonts too; search for info via Google or ?? on www)
You could do a simple version using "CL" as abbreviation but looks much better as an inserted symbol:
℄
You can get this symbol from Arial Unicode (most every PC has this font); and the code number is U2104.
Some symbols can be inserted using alt#### (such as alt0165 =