“Tilda” is that wavy line (~) found in the neighborhood of the top-left of your keyboard and accessed with the shift-key held down. Yep, there it is! Well, Tilda is doing nifty things in a Google search to get more results out of a word than Google would return without it. Use “tilda” directly before a search word, and Google will return results for the word synonyms of the word as well – in this way searching something closer to concepts rather than specific/exact word. (For example, searcing ~pen returns pencils, graphite, and sketch.)
I never did know what that wavy thingy was called and I had no idea it was good for anything. This'll save a lot of time doing searches. Man, I learn something every day! Thank goodness I have such bright blogbuddies.