Which of the following is specifically mentioned as an implement of Masonry?

In Masonic symbolism, the trowel is specifically mentioned as an implement of Masonry because it represents the spreading of the cement of brotherly love and affection among Masons. This symbolism underscores the importance of unity and the bonding of relationships within the fraternity. The trowel's function in masonry work is to spread concrete, paralleling the need for Masons to spread goodwill and understanding among one another, fostering a supportive and harmonious environment.

In contrast, while the hammer, square, and apron are also significant in Masonic symbolism, they symbolize different aspects of the craft. The hammer typically represents the force required to shape actions and thoughts, while the square signifies morality and the need for fairness in dealings. The apron denotes purity and the commitment to the principles of Masonry. Each of these tools carries its own meaning, but the trowel's specific mention emphasizes the social aspect of Masonic teachings.