Yes 3 pins usually, same as UK. (G in the following site) However, I found 2 pins sometime as well. (C) You can purchase exchange adapter easily.
try doing a google search for "custom pins" or "make your own pins" i promise you will find about 500,000 sites that do it. just be sure to check with the BBB to make sure they are a legit business. bbb.org
Straight pins (shaped like nails, but *much* smaller and thinner) used to be sold stuck through a paper (many pins side by side, kind of woven in and out of the paper). Maybe they still are sold that way. They are used in sewing and used to be relati...