mystery flashing symbol on dash

Hi all,
Not been on here for eons , I changed my car but bought my daughter a 05' plate 1.2k12 . Getting it prepped for her ... Anyway what I have is a symbol on the digital part of dash . It's at the bottom left hand side it's flashing and has two symbols ...left symbol is a black arrow , right symbol is a black circle. Never came across this before and is not in owners handbook . Weird one is this .
Whilst I am on here anyone replaced oxygen (lambda)sensor. Any tips please .
Many thanks for any replies
 
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