No, sorry. I can confirm it isn't the word 'colon'.
Well, that shoots the bottom out of just about everything I've been thinking. That's OK!
Not the word "colon." OK, well: the symbol? Let me think on it.
The season come again for winter’s tales, I tell you one which my nurse told to me As watched I warily the swirling snows. “I’ll raise one up,” she swore, “of ghosts by night…”
That's OK!