What does [MJxME] in front of a product name mean?

Square brackets at the very front of a product name are usually a label indicating which line the product belongs to. If [MJxME] is attached to the front, it is a product from the wedding collaboration line created together with creator Park Min-ju^[1][2].

Even within the same line, points to note differ by item. Lilium Bloom Necklace is for the neck, a product carrying the line's name as is^[3]. Coming down to the wrist, there is Pearl String Bracelet^[4], and in a set configuration bundling this bracelet together with Everyday Pearl Bracelet - 2mm, Park Min-ju's wrist circumference is 13cm, but the product was specially made at 15cm^[5]. Moving down to the ankle, the focus shifts from dimensions to handling. Red Berry Bold Anklet may deform in shape or be damaged if subjected to strong impact^[6]. Because an accessory worn on the ankle is in a position prone to bumping into shoes, floors, or chair legs, it is best to check it occasionally when sitting down and standing up.

hmmm, the two sets of letters with an x in between inside the square brackets read as the initials of the collaborator and the brand — a notation commonly used for collaboration lines, so just by looking at the name, you can tell that a product with this label carries both names together.