I've been spending more time than I usually do at our local post office.
I'm learning about shipping prices and envelopes and overseas first class rates
since opening my Watercolor Painting Etsy shop. While I was getting ready to
send a painting to the U.K. other day I took a second look
at a sign that has been over the P.O. door for a very long time
and went, "hmmmmmmm." to myself.
When something is standing still, it's stationAry.
That piece of paper you write a letter on is stationEry.
Let the "E" in stationery remind you of envelope.
After working for several years at a wedding invitation printing business
I should have seen that one sooner.