plotting points formatted in utf8

I am trying to plot points specified in utf8 using the pt "..." option 
as mentioned in the gnuplot manual. I am using gnuplot v5.2 running in 
Debian Buster.

My settings are:
	reset session
	set encoding utf8
	set terminal x11 1 nopersist enhanced

As an example I tried the Bullseye point:
◎  9678(hex)   25CE(utf8)

It is not clear what syntax I should use to express the character.
All of the versions:
	pt "◎"
	pt "0x9678"
	pt "U+25CE"

failed to plot the bullseye ◎

What am I missing?

Any help much appreciated

-- 
Geoff

33 Ashbury Close, Cambridge CB1 3RW 01223 710582


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