find_chars.py

import freetype
import osmium
import sys

face = freetype.Face("/System/Library/Fonts/STHeiti Medium.ttc")

def check_tags(t,o):
    for k,v in o.tags:
        if k == 'name':
            for char in v:
                if face.get_char_index(char) == 0:
                    print(f'{char},{ord(char)},{v},https://openstreetmap.org/{t}/{o.id}')

class Handler(osmium.SimpleHandler):
    def node(self,n):
        check_tags('node',n)

    def way(self, w):
        check_tags('way',w)

    def relation(self,r):
        check_tags('relation',r)

Handler().apply_file(sys.argv[1])

taiwan_unicode.csv