Activity list - What does the OR after the frequency mean ?

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S79RP
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Joined: 2017/11/29 - 10:56
Activity list - What does the OR after the frequency mean ?

I like to see who is online - I see those with just the freq after their call sign and assume they are TX/RX then I see those with just an R after their frequency and assume they are RX only BUT what is the OR after the frequency please ? and are my previous assumptions correct ?