Shabbos Is a Name of Hashem
The Zohar calls Shabbos a Name of Hashem; the Bnei Yissaschar shows that the word and its number point to the Name that gives life to the whole of creation.
The Zohar asks what Shabbos is, and answers that it is a Name of Hashem, a Name that is complete on every side. The Bnei Yissaschar explains this through the letters of the Torah. There are twenty-seven letters in the Hebrew alphabet when the final forms are counted, and each carries a spark of life from the Name Havaya. Twenty-seven Names of Havaya add up to the number of the word Shabbos. Through them Hashem created every world, and in the six days of creation He built the world's body. Shabbos is its soul and form, which is why the day is called by His Name. He adds a practical point from this: because Shabbos is a Name of Hashem, one should not mention it carelessly, nor where words of Torah may not be spoken. He notes that he has known careful people who were cautious about this.
Source: Bnei Yissaschar, Maamarei Shabbosos, Maamar 1:1
The name of Shabbos is not an ordinary word to the Bnei Yissaschar. Starting this week, try pausing for a breath before you say it in conversation, so that the word feels like something precious rather than a calendar entry. When you say Shabbos shalom to someone, mean it as a blessing. And as Friday afternoon arrives, think of the day as a living presence you are about to welcome, and let that change the pace of your last hour before candle lighting.