What are their names?

[vicking]

What are the names of those circled in red in the attachment?

 

[Old Nick]

??
node icons

 

[javakhir]

for XF 2.3 you can use this https://xenforo.com/community/resources/cxf-node-icons-with-image.7490/

for XF 2.2 the best addon is [XenGenTr] Forum icon customization.