Here is my interpretation:
1. It has a lambda, which points to maths and lambda-calculus/mathematical logic in particular.
2. It has the atheist logo, which says that I identify with atheism.
3. The lambda in almost inscribed in a circle, which says I like the Half-Life series.
4. The colour of the lambda/atheist logo is electric cyan (00ffff), which is also known as aqua. This refers simultaneously to physics (electric), chemistry (cyanide), and biology (water).
5. The area around it is black, which symbolises ignorance etc.