"כתביי יד" refers to documents, texts, or notes that have been written by hand, as opposed to being typed or printed. In many contexts, handwritten manuscripts can be particularly valuable, especially if they are original works or contain personal notes and annotations. They are often seen as more personal and authentic, capturing the unique handwriting style of the author or scribe. Handwritten manuscripts are frequently used in historical, legal, or religious contexts, where the original form of a document holds special significance.