What to call the characters-based decoration found in many announce emails

Question

Many emails received from Japanese companies contain characters-based dingbat-style ornament like this:

■□■□■□────────────────────────────  
blablablablablablablabla  
────────────────────────────■□■□■□

■blabla  
｜　bla：blablabla  
｜　bla：blabla

■┓　　bla 　　┏■  
┗┛━━━━━━━━━━┗┛  
...

It seems to be a particular case of Shift_JIS art (which I don't know how to say in Japanese either, by the way).

What do you call this type of email decoration in Japanese?

Answer 1

This decorative frame can be called 飾り罫 (かざりけい).

飾り罫 can be text-based or not, it means any kind of dingbat-style framing in general.