What does this string mean in public key certificates and messages?

Published: 1/12/2019
What does this string mean in public key certificates and messages?
Source: SECURITY.STACKEXCHANGE.COM

I noticed that the string "ICAgICAgICAgICAgICAg" in various repeating lengths appears fairly often in public key certificated and ciphertexts. What does this mean? Is it some kind of padding? Is it a quirk of the encryption?

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