Hamza (Arabic: الهَمْزة‎, (al-)hamzah) (ء) is a letter in the Arabic alphabet, representing the glottal stop [ʔ]. Hamza is not one of the 28 "full" letters, and owes its existence to historical inconsistencies in the standard writing system. In the Phoenician and Aramaic alphabets, from which the Arabic alphabet is descended, the glottal stop was expressed by aleph (), continued by alif (  ) in the Arabic alphabet. However, alif was used to express both a glottal stop and a long vowel /aː/. To indicate that a glottal stop, and not a mere vowel, was intended, hamza was added diacritically to alif. In modern orthography, under certain circumstances, hamza may also appear on the line, as if it were a full letter, independent of an alif.

The hamza letter on its own always represents hamzat qaṭʿ (همزة قطع); that is, a phonemic glottal stop. Compared to this, hamzat waṣl or hamzatu l-waṣl (همزة الوصل) is a non-phonemic glottal stop produced automatically at the beginning of an utterance. Although it can be written as alif carrying a waṣlah sign ٱ, it is usually indicated by a regular alif without a hamza. It occurs, for example, in the definite article al-, ism, ibn, imperative verbs and the perfective aspect of verb forms VII to X, but is not pronounced following a vowel: (e.g. al-baytu l-kabīru for written البيت الكبير). It occurs only at the beginning of a word following a preposition or the definite article.

A baby mama (also baby-mama and baby-mother) is generally defined as a mother who is not married to her child's father, although the term is often used with other meanings as well.

Originally, the term was used by the fathers of children born out of wedlock to describe the mothers of their children, but the term is now in general use to describe any single mother. Since entering currency in U.S. tabloids, the terms baby mama and baby daddy have even begun to be applied to married and engaged celebrities.

The Oxford English Dictionary defines baby mama as "the mother of a man's child, who is not his wife or (in most cases) his current or exclusive partner".

Peter L. Patrick, a linguistics professor who studies Jamaican English, has said of the terms baby mother and baby father, "[they] definitely imply there is not a marriage—not even a common-law marriage, but rather that the child is an 'outside' child".

The term "baby-mother" in Jamaica is most often used to describe any pregnant woman or any woman with a young child. For example on a crowded bus you may be admonished to give the "baby-mother" a seat. However in this case no judgement is being made about her marital status and literally means "the mother of the child".

Hamza Yusuf Hanson is an American Islamic scholar, and (with Zaid Shakir and Hatem Bazian) is co-founder of Zaytuna College in Berkeley, California, United States. He is a convert to Islam, and is one of the signatories of A Common Word Between Us and You, an open letter by Islamic scholars to Christian leaders, calling for peace and understanding. He has described the 9/11 attacks as "an act of 'mass murder, pure and simple'". Condemning the attacks, he has also stated "Islam was hijacked ... on that plane as an innocent victim".The Guardian newspaper in the United Kingdom reported that he "is arguably the west's most influential Islamic scholar" and added that "many Muslims find his views hard to stomach."

Hamza Yusuf was born to two academics in Washington State and raised in Northern California. In 1977, he became Muslim and subsequently traveled to the Muslim world and studied for ten years in the United Arab Emirates, Saudi Arabia, as well as North and West Africa. Hamza Yusuf spent four years studying in the United Arab Emirates and elsewhere in the Middle East. Later he traveled to West Africa and studied in Mauritania, Medina, Algeria, and Morocco under such scholars as Murabit al Haaj; Baya bin Salik, head of the Islamic court in Al-'Ain, United Arab Emirates; Muhammad Shaybani, Mufti of Abu Dhabi; Hamad al-Wali; and Muhammad al-Fatrati of Al Azhar University in Cairo, Egypt.^{[citation needed]} After more than a decade abroad, he returned to the United States and earned degrees in nursing from Imperial Valley College and religious studies at San José State University.^{[citation needed]}