Does anybody know what this would mean as part of an address? I got an email titled "seoladh baile 7RL". I can't for the life of me figure out what "7RL" is.

Help!

Never mind!
I just now found the answer for Shoshana via Google: "7RL" means agus araile (et cetera).

http://www.adf.org/rituals/explanations/focloir-draiochta.html

Here's a bit more. The sign that we can approximate with the numeral "7" goes back to the early manuscript tradition. It can stand for either Latin "et" or Old Irish "ocus" (mod. "agus"), thus the abbreviation "7c." (etc.) is also used. Any abbreviation or scribal contraction like this is called a "nod" in Irish, from Latin "nota". It's not a common word, but does appear in a common proverb:

Is leor nod don eolach. = A word to wise is sufficient.

For some other "noda", see:

http://quidnunc.net/~garyi/noda/notae.html

Up to the late 1960s all post office vans carried the logo "P 7 T" written in the old uncial script. It was abbreviation for Post agus Telegrafa, although many people blieved it meant "phone 7 times" because of the unreliability of the phone service

There was a much ruder version, indeed! :-)

"A variant of 'r': never initial, and usually found following 'o'."

does this suggest that initial r was in a long time not compleatly symmetrical (both polarities?)