umber of lines written on the parchment in tefillin and mezuzot. So, "מנין השיטין" translates to "the count of the lines."

Here is a more detailed explanation:

1. Tefillin: As mentioned earlier, the tefillin contain biblical passages. These passages are meticulously written in black ink on square pieces of kosher animal parchment:

   • Tefillin Shel Yad (Hand Tefillin): The single scroll within this tefillin typically has four columns of text.
   • Tefillin Shel Rosh (Head Tefillin): Each of the four compartments contains a scroll, each with the text arranged in a single column.

2. Mezuzah: The mezuzah scroll is traditionally inscribed in 22 lines. The precise formation of these lines is governed by halachic (Jewish legal) standards to ensure they conform to traditional requirements, which include specific line breaks and column widths.

The meticulous adherence to these details in the writing process underscores the sanctity and importance of these mitzvot (commandments) in Judaism, symbolizing devotion and adherence to God's laws.