钢笔 (gāng bǐ) literally means 'steel pen' — 钢 (gāng) refers to steel or metal, and 笔 (bǐ) means 'pen' or 'writing instrument'. Historically, it distinguished fountain pens (which have a metal nib) from traditional ink brushes (毛笔) and later ballpoint pens (圆珠笔). Today, it broadly refers to fountain pens — elegant, refillable writing tools that use liquid ink fed through a metal nib.

While less common in everyday digital life, 钢笔 is still used in formal contexts: signing documents, calligraphy practice, gift-giving, or by enthusiasts who appreciate fine writing instruments. It carries connotations of tradition, precision, and craftsmanship. Unlike disposable pens, a quality 钢笔 is often seen as a long-term tool or even a collector’s item — many people inherit or receive one as a meaningful gift for graduation or a milestone.