You'd like toknow what you call a tool that is used for calligraphy? In the UK this would be referred to as 'an ink brush' or to be perfectly clear, 'a high quality brush for calligraphy'. Other types of brush might be: paint brush (for walls or art), a toilet brush (for cleaning the toilet) or a hair brush.
"John uses a calligraphy brush with a fine point for writing signs in Chinese."
書道に使われる道具の言い方を知りたいということですね。イギリスではこれは 'an ink brush'（筆）と呼ばれます。あるいは、より明確に 'a high quality brush for calligraphy'（書道用の上質な筆）と言うこともできます。
「筆」には他に、
paint brush = 絵筆／ペンキ用のはけ
toilet brush = トイレブラシ
hair brush = ヘアブラシ
などもあります。
"John uses a calligraphy brush with a fine point for writing signs in Chinese."
（ジョンは中国語で看板を書くとき、先の細い毛筆を使います）
Calligraphy is mostly seen on formal invites in America.
Brush pens are more convenient since you don't have to mix the color(ink) with water and the brush.
Brush pens that are firm and have a soft tip will create thick or thin lines.
The pictured tool is most commonly referred to as an "Ink brush" or "Writing brush". This tool is used predominantly in calligraphy, calligraphy is used to create formal invites to events as it looks extremely professional and classic.
A calligraphy brush is a specific brush that has an angled tip used to write fancy lettering. Some countries like China use calligraphy brushes to write fancy Chinese symbols.
A calligraphy brush' は、装飾文字を書く際に用いられる角度のついた筆です。中国などでは、'A calligraphy brush' は書道に用いられます。
Brush
I think we would just refer to this as a brush.
For instance, 'have you got any spare brushes I could borrow?'
I hope this helps.
Have a great day.
Will
Brush（筆）
たぶんこれは単に 'Brush' と呼ばれると思います。
例えば：
'Have you got any spare brushes I could borrow?'（余った筆があれば貸してもらえませんか）
参考になれば幸いです。
良い一日を。
ウィル
The hairy part of a paintbrush is made of 'bristles'.
A paintbrush set is a collection or
batch of paintbrushes that consists of different
types of brushes.
A paintbrush'（絵筆）の毛の部分は 'Bristles'（剛毛）でできています。
'A paintbrush set'（絵筆セット）は、いろいろな種類の筆がセットになったものをいいます。
The tool usually used for calligraphy is called an "ink brush" or a "writing brush".
You may use these phrases in a dialogue in the following way:
Sam: What is that you have there?
Candy: Oh, it's an ink bush/writing brush that I got for my son. He's really into calligraphy these days.
Sam: Cool. How much did it cost?
Candy: It was only $5
書道で使われる「筆」は英語では "ink brush" や "writing brush" と呼ばれます。
これらのフレーズは会話の中で次のように使うことができます。
サム: What is that you have there?（それは何ですか）
キャンディー: Oh, it's an ink bush/writing brush that I got for my son. He's really into calligraphy these days.（筆です。息子のために買ったんです。最近書道にすごくハマっているので）
サム: Cool. How much did it cost?（いいですね。いくらしましたか）
キャンディー: It was only $5（5ドルでした）
The first two example words is what we would use to describe the type of brush that is shown in the picture and is primarily used for calligraphy. These brushes can be defined as having a very thin point at the end of the brush to have precision within the writing.
A paint brush is the term for the style of brush that is used more for art such as watercolor paintings and the stuff you would normally see within museums that include western arts.
オランダ 
日本 
イギリス 
アメリカ合衆国 
南アフリカ 
