Vehementia does sound cool! I like it! 
For me, Devil's Triangle is another name for the Bermuda Triangle which is a region in the ocean where ships disappear. It can be interpreted in a few ways - either as the dark abyss of the Internet, or the mysteries revolving around the murders that happen in the novel. It also refers to the love triangles that are present among the different characters! 
Shackles is symbolic of the limitations and expectations that are expected of the Empress Dowager. She's bound to her duty and to her people, while sacrificing her own desires.
Finally, Dark Bytes represents the dark side of technology and how it has transformed our lives in the present and in the near future. 