quoting of CI4 /icon in Arch Linux Book

My book on Arch Linux is out https://www.amazon.com/dp/B0C2SQ8RDM
So far sales UK,Italy , france and USA
I have a section on web development which includes getting CI4 up and running from apache. The cover of my book is a tad boring ( hey what do you expect from computer people ) so i was thinking of putting accross front cover  rEFInd with icon , will send Rod Smith and email on that . Also something like "web dev  apache  and Codeigniter".

I could do with clarification from  developers what I have permission to use i.e is the name "CodeIgniter" trade marked ? Can i quote name ? Can i use the flame icon 

cheers

CMS CI4 A CMS system, runs out of the box written on top of CI4

Arch Book  CodeIgniter4 on Apache(pages 92-114) 

Github  

See https://www.codeigniter.com/the-fine-print

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

ok cheers thats great, i will follow guidelines

ok disclaimer etc will be on page 75 of book and will appear in book on next update

CMS CI4 A CMS system, runs out of the box written on top of CI4

Arch Book  CodeIgniter4 on Apache(pages 92-114) 

Github