Two SIDS Received for FB

Technical Help
#1

Hello QuantRocket Users/support team!

I ran the following code, and received two SIDS for the ticker "FB" (Facebook). A few questions:

Why do some symbols have two sids and others have one?

Is this an error?

Which SID is the correct one?

Thank you,
Aarav Sawlani

#2

Ticker symbols can be recycled and thus are not unique over time. That’s why Sids are necessary. The ticker FB used to belong to a different company. You can look at the Name field to see which is which.