Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Writing in a dream indicates cunning and deceit. Whoever sees himself write a letter is plotting against someone. Writing with the right hand indicates good, and with the left indicates evil.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Writing indicates the fulfillment of needs. Whoever sees himself write and leaves no trace is abandoning his work.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Writing is interpreted as sustenance. Whoever sees himself write his name will gain sustenance.