This string appears to be a unique technical identifier or a snippet of encoded data—likely a tracking parameter, a session ID, or a specific piece of code from an AMP (Accelerated Mobile Pages) framework.
Decoding the Digital Signature: Understanding AMP Identifiers and Tracking
These likely represent delimiters for sub-parameters within a link, commonly used by web developers to track user sessions, marketing campaign performance, or specific page states.
However, it's essential to use keywords strategically and avoid keyword stuffing, which can lead to penalties from search engines. Instead, focus on creating high-quality content that naturally incorporates your target keywords.