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This picture was taken by one of the cameras on the Perseverance rover. What is pictured here ? And what is the purpose of this image?

enter image description here

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That is a camera calibration target, specifically the Intensity Target Maze.

A picture of the three "outreach" targets

Purpose:

The top target row consists of five targets used for SHERLOC calibration including Raman and fluorescence spectral accuracy, response curve, ambient light reflection, spectral mapping, and laser parameters.

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Three targets additionally serve unique education and public outreach purposes. The Mars meteorite, a slice of Sayh al Uhaymir 008 (SaU008) collected in Oman in 1999, will represent the first piece of Mars to be returned to the planet’s surface (Fig. 3a). The intensity target design incorporates an intricate maze (Fig. 3b), and the clear polycarbonate space suit visor material is backed by a distinctive Geocaching trackable marker (Fig. 3c).

This image shows the location of the targets on the rover.

The target location is shown on the front of the rover

SCT = SHERLOC Camera Target

The target in the question is located in position 4.

Reference: THE CALIBRATION TARGET FOR THE MARS 2020 SHERLOC INSTRUMENT

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    $\begingroup$ As a Holmes fan, I am pleased to note that there is a picture/icon of Sherlock Holmes on Mars. $\endgroup$ Mar 2, 2023 at 22:02
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    $\begingroup$ "The Mars meteorite, a slice of Sayh al Uhaymir 008 (SaU008) collected in Oman in 1999, will represent the first piece of Mars to be returned to the planet’s surface" - I'm disappointed we didn't get an Xbox Achievement in real-life for doing that... $\endgroup$
    – Dai
    Mar 3, 2023 at 23:42

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