Five final consonants - the Sofit letters

Numeric value

500 https://en.wikipedia.org/wiki/Kaph#Hebrew_pronunciation
600 https://en.wikipedia.org/wiki/Mem#Hebrew_Mem
700 https://en.wikipedia.org/wiki/Nun_(letter)#Variations
800 https://en.wikipedia.org/wiki/Pe_(Semitic_letter)#Final_form_of_Pe/Fe
900 https://en.wikipedia.org/wiki/Tsade#Variations

https://en.wikipedia.org/wiki/Hebrew_alphabet#Alphabet_2
 https://www.hebrew4christians.com/Grammar/Unit_One/Final_Forms/Printer_Version/printer_version.html