The Letter G

We have several sets of magnetic letters in our house — three sets of capital letters, and one set of small letters. Each set usually contains a couple extra of each vowel, which makes sense. But also, each set contains an extra letter G. Why? I wouldn’t have guessed that an extra G is essential to spelling most grade-school words. An extra S, or T, maybe an N, I could see. A G? What’s that about?

I smell conspiracy.