Resistor coding

[lavejim1]

Hi guys. 
new to this forum, and i need some clarification.  this may seem very newbie but here goes.  I have years of experience in troubleshooting and reading schematics, but am just getting back into building.  While looking at several schematics i noticed that the resistors are coded funny.  Most i figured out, such as 2m2 is a 2.2 megohm, and 2k2 is 2200 ohm, but some are called for example 220R or 470R.  what value is this and are there any other codes that an old guy my not be aware of?  thanks for the help and i really like this forum!!

[J M Fahey]

Lucky you, this one is simple.
To avoid writing Ohm a zillion times and since few font sets (and no keyboard, except a Greek one) have the Omega sign, informally r or R substitutes that sign for practical purposes.
Also the multiplier letter is used substituting the decimal point.
As you guessed, 2r2 means 2.2 ohms and so on.
I'm not sure about Ciryllic keyboards, maybe somebody can answer that.

[lavejim1]

DUH!  Should have been obvious.  Thanks for the info J M.  I am really looking forward to building some cool stuff for myself and my buds