I'd like to know why this question was closed as being nonconstructive:
Welcome to the community. This question is not a good fit to our Q&A format. We expect answers to generally involve facts, references, or specific expertise; this question will likely solicit opinion, debate, arguments, polling, or extended discussion. Please ask questions about specific issues you are having, even when asking for a review of a specific design, but not general idea-gathering or brainstorming.
– Philip Regan ♦ 2 hours ago
Although the question probably could have been worded slightly better, the majority of the answers were decidedly objective as opposed to just passing on random ideas. While the OP was asking for ideas to augment his logo, he/she did narrow the question to asking for symbols/strings that represent code (of which there are several widely-accepted examples, three of which were posted.)
Graphic design, being (to some extent) an art, as opposed to a science, is going to bring many borderline objective/subjective questions like this one. Is this going to be the standard for when a user asks a question about accepted visual representations of other ideas?
Also, I'd like to cite three other very similar questions that have not been closed.